Hi Chad,
The relay error comes in this section:
Jul 31 14:36:33 mail postfix/submission/smtpd[645290]: generic_checks:
name=permit_mynetworks status=0
Jul 31 14:36:33 mail postfix/submission/smtpd[645290]: generic_checks:
name=reject_unauth_destination
Jul 31 14:36:33 mail postfix/submission/smtpd[645290]:
reject_unauth_destination: emailal...@domain.com
Jul 31 14:36:33 mail postfix/submission/smtpd[645290]:
permit_auth_destination: emailal...@domain.com
Jul 31 14:36:33 mail postfix/submission/smtpd[645290]: ctable_locate:
leave existing entry key c...@bersche.com?emailal...@domain.com
Jul 31 14:36:33 mail postfix/submission/smtpd[645290]: NOQUEUE: reject:
RCPT from backup.bersche.com[172.18.172.106]: 554 5.7.1
<emailal...@domain.com>: Relay access denied; from=<c...@bersche.com>
to=<emailal...@domain.com> proto=ESMTP helo=<localhost>
Jul 31 14:36:33 mail postfix/submission/smtpd[645290]: generic_checks:
name=reject_unauth_destination status=2
Jul 31 14:36:33 mail postfix/submission/smtpd[645290]: >>> END Recipient
address RESTRICTIONS <<<
Jul 31 14:36:33 mail postfix/submission/smtpd[645290]: >
backup.bersche.com[172.18.172.106]: 554 5.7.1 <emailal...@domain.com>:
Relay access denied
Jul 31 14:36:33 mail postfix/submission/smtpd[645290]: watchdog_pat:
0x558e6487faa0
Jul 31 14:36:33 mail postfix/submission/smtpd[645290]:
vstream_fflush_some: fd 10 flush 53
Jul 31 14:36:33 mail postfix/submission/smtpd[645290]: smtp_get: EOF
Yeah, I was looking at this on Monday when my internet problems started.
From what I an see there it's not DNS. Your server is rejecting the
relay for the recipient domain "emc.com" with the message "Relay access
denied."
Whitelisting the sending IP in "Relay Email From Hosts/Domains/IP
Addresses" in the GUI does the trick for Sendmail, but Postfix is more
picky it seems.
So this is really something that we need to put into "mynetworks" instead.
Change your "mynetworks" line in /etc/postfix/main.cf to something like
this if you want to allow the whole 192.168.0.0/16 network to be able to
relay through it:
mynetworks = 127.0.0.0/8 [::1]/128 192.168.0.0/16
Then restart Postfix and see if that helps:
systemctl restart postfix
--
With best regards
Michael Stauber
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